We've got a group policy that copies a wallpaper file down to local machines, and a reg key to force the wallpaper to use that file. We doing a breast cancer awareness background, and replaced the file on our file server, which actually does copy down to the workstations, but doesn't seem to actually update the wallpaper. The file name\location are the same. I've ran gpupdate /force, logged off and on, and rebooted the computer.
It seems to update on some computers, not all. Machines are running Windows 7-10.

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Windows caches the wallpaper file, so it won't change immediately just by changing the specific file. It would work better if your new wallpaper had a new name and the policy was changed to reflect that.

Alternatively the script the copies down the new wallpaper could also set the new wallpaper (you'd probably have to use Powershell for that).

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